UnCommon Artistry SS/JR20/O/4 Sterling Silver Open Jump Rings 4mm Heavy 20 Gauge (50) SOLID STERLING SILVER 925 HEAVYWEIGHT 4MM JUMP RINGS The perfect jump ring to make the female side of a clasp on the end of a chain, necklace, bracelet, anklet... it's a jump ring so it's easy to open, but it's made of thicker wire than usual (.032 in. thick instead of the usual .025 or .028 in.), so it will stay more firmly closed and resist wear and tear. Measurements: 4mm outside diameter. Wire is 20 gauge or .032" Quantity: 50 jump rings- UnCommon Artistry Brand is guaranteed to be sterling. Brand: UnCommon Artistry-Every package is marked with UnCommon Artistry sticker. UnCommon Artistry is a registered brand with the US Patent and Trademark Office. Our logo, brand, and slogan are all intellectual property of UnCommon Artistry. UnCommon Artistry is the only authorized distributor of this brand on Amazon.